dma: rcar-audmapp: add DT support
This patch adds DT support to Audio DMAC peri peri driver. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> [horms+renesas@verge.net.au: Do not add trailing blank line to rcar-audmapp.txt] [horms+renesas@verge.net.au: squashed patch to add NULL terminater to audmapp_of_match] Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Kuninori Morimoto
Simon Horman
parent
75bfa5f60a
commit
caf18c27dd
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@ -0,0 +1,29 @@
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* R-Car Audio DMAC peri peri Device Tree bindings
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Required properties:
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- compatible: should be "renesas,rcar-audmapp"
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- #dma-cells: should be <1>, see "dmas" property below
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Example:
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audmapp: audio-dma-pp@0xec740000 {
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compatible = "renesas,rcar-audmapp";
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#dma-cells = <1>;
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reg = <0 0xec740000 0 0x200>;
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};
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* DMA client
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Required properties:
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- dmas: a list of <[DMA multiplexer phandle] [SRS/DRS value]> pairs,
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where SRS/DRS values are fixed handles, specified in the SoC
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manual as the value that would be written into the PDMACHCR.
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- dma-names: a list of DMA channel names, one per "dmas" entry
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Example:
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dmas = <&audmapp 0x2d00
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&audmapp 0x3700>;
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dma-names = "src0_ssiu0",
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"dvc0_ssiu0";
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@ -22,6 +22,7 @@
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/dmaengine.h>
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#include <linux/of_dma.h>
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#include <linux/platform_data/dma-rcar-audmapp.h>
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#include <linux/platform_device.h>
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#include <linux/shdma-base.h>
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@ -63,6 +64,8 @@ struct audmapp_desc {
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dma_addr_t dst;
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};
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#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
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#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
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#define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
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#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
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@ -114,38 +117,50 @@ static void audmapp_start_xfer(struct shdma_chan *schan,
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audmapp_write(auchan, chcr, PDMACHCR);
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}
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static struct audmapp_slave_config *
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audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)
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static void audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
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u32 *chcr, dma_addr_t *dst)
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{
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struct audmapp_device *audev = to_dev(auchan);
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struct audmapp_pdata *pdata = audev->pdata;
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struct audmapp_slave_config *cfg;
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int i;
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*chcr = 0;
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*dst = 0;
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if (!pdata) { /* DT */
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*chcr = ((u32)slave_id) << 16;
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auchan->shdma_chan.slave_id = (slave_id) >> 8;
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return;
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}
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/* non-DT */
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if (slave_id >= AUDMAPP_SLAVE_NUMBER)
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return NULL;
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return;
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for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
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if (cfg->slave_id == slave_id)
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return cfg;
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return NULL;
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if (cfg->slave_id == slave_id) {
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*chcr = cfg->chcr;
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*dst = cfg->dst;
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break;
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}
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}
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static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
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dma_addr_t slave_addr, bool try)
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{
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struct audmapp_chan *auchan = to_chan(schan);
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struct audmapp_slave_config *cfg =
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audmapp_find_slave(auchan, slave_id);
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u32 chcr;
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dma_addr_t dst;
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audmapp_get_config(auchan, slave_id, &chcr, &dst);
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if (!cfg)
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return -ENODEV;
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if (try)
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return 0;
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auchan->chcr = cfg->chcr;
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auchan->slave_addr = slave_addr ? : cfg->dst;
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auchan->chcr = chcr;
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auchan->slave_addr = slave_addr ? : dst;
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return 0;
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}
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@ -244,16 +259,39 @@ static void audmapp_chan_remove(struct audmapp_device *audev)
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dma_dev->chancnt = 0;
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}
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static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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dma_cap_mask_t mask;
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struct dma_chan *chan;
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u32 chcr = dma_spec->args[0];
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if (dma_spec->args_count != 1)
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return NULL;
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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chan = dma_request_channel(mask, shdma_chan_filter, NULL);
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if (chan)
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to_shdma_chan(chan)->hw_req = chcr;
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return chan;
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}
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static int audmapp_probe(struct platform_device *pdev)
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{
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struct audmapp_pdata *pdata = pdev->dev.platform_data;
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struct device_node *np = pdev->dev.of_node;
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struct audmapp_device *audev;
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struct shdma_dev *sdev;
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struct dma_device *dma_dev;
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struct resource *res;
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int err, i;
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if (!pdata)
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if (np)
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of_dma_controller_register(np, audmapp_of_xlate, pdev);
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else if (!pdata)
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return -ENODEV;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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@ -315,12 +353,18 @@ static int audmapp_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct of_device_id audmapp_of_match[] = {
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{ .compatible = "renesas,rcar-audmapp", },
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{},
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};
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static struct platform_driver audmapp_driver = {
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.probe = audmapp_probe,
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.remove = audmapp_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "rcar-audmapp-engine",
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.of_match_table = audmapp_of_match,
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},
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};
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module_platform_driver(audmapp_driver);
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